Principle of Operation
The DM5 series resolver decoder provides an absolute encoder system in conjunction with any one of the AVG Automation's single-turn resolvers.  As shown in the diagram on the next page, the resolver rotor winding is excited from a reference sinusoidal generator inside the DM5 unit.  The analog output signals from the resolver stator windings, after signal conditioning in the buffer amplifiers, are decoded to digital format in the Ratiometric Tracking Converter.  The zero offset, set by the front panel thumbwheels, is continuously added to this value and the resultant position is displayed on the front panel of the unit.  The position information is also made available in a parallel format for external devices, such as PLCs, remote displays etc.

Programmable Full Scale Offset for Easy Set-up
You can mount the resolver on the machine without any concern for mechanically matching the resolver zero to the machine zero.  Once the resolver is coupled to the machine shaft, the only thing you have to do is to bring the machine

to a known position, say home position, and set an offset number using the front panel thumbwheel switches until the display reads zero.  Now the resolver zero is aligned with the machine zero.  This is especially useful during initial start-up in that it reduces the set-up time.  The offset can also be used to compensate for any wear on the machine.

Variety of Outputs, Built-in PC-Handshake, Permit Interface to Any PLC
BCD, natural Binary, or Gray Code output formats are available with a choice of TTL, PNP (sourcing) transistor or NPN (sinking) transistor outputs.  Optional PLC synchronization circuit provides an error-free method of interfacing BCD position data from the decoder to any PLC in the market.  Upon receipt of a data transfer command from the PLC, the stable data is latched and made available to the PLC.

Multiplexing Capability
The TTL type of outputs have multiplexing capability, which allows more than one decoder to be connected to the same control unit for multi-axis applications.  For multiplexing PNP or NPN type outputs, consult the factory.